A testator is the person who creates and signs a will. The testator must have the mental capacity to understand the document, act voluntarily, and meet all legal requirements for the will to be valid.
Legal Reference:
Defined under the Wills Act 1837.
A testator must be aged 18 or over, and the will must be signed in the presence of two independent witnesses.
Sources:
Wikipedia – https://en.wikipedia.org/wiki/Testator
Wikidata – https://www.wikidata.org/wiki/Q3504122
Knowledge Graph – https://www.google.com/search?kgmid=/m/05k455
DBpedia – http://dbpedia.org/resource/Testator
Product Ontology – http://www.productontology.org/id/Testator